Lime tree and Linden

Lime tree noun - Any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber.

Linden is a synonym for lime tree. In some cases you can use "Linden" instead a noun phrase "Lime tree".

Linden noun - Any of various deciduous trees of the genus Tilia with heart-shaped leaves and drooping cymose clusters of yellowish often fragrant flowers; several yield valuable timber.

Lime tree is a synonym for linden. (British) You can use "Lime tree" instead a noun "Linden".